2018 Porsche 911 GT3 6 Speed Manual Review – Video

Replacing the former GT3’s 475-hp 3.8-liter, the new model’s 4.0-liter engine produces 500 horsepower. Torque is up, too, to 339 lb-ft compared with 324. Specifications junkies will note that those figures match those of the GT3 RS and the 911 R.

Porsche did tweak the engine’s internals, borrowing valvetrain tips from the 911 RSR race car and adding a new oil pump, a stiffer crankshaft, a larger-diameter main bearing, and a mildly tweaked intake.

The 4.0-liter flat-six is a mechanical beast that Porsche claims can propel the 2018 GT3 to 60 mph in just 3.2 seconds and runs out of steam at 197 mph. Those figures are for the PDK-equipped model; the stick-shift version’s zero-to-60-mph acceleration claim is softer (3.8 seconds), although top speed inches up by 1 mph to 198 mph.